Compositions consisting of woolen fibers and artificial threads



Patented May 31, 1932 UNITED STATES PATENT OFFICE ALBERT MOHRING ANDGUIDO SCEULTZE, OF ELBEIRFELD, AND PAUL SCHLACK, OF

BEBLIN-KABLSHORST, GERMANY, ASSIGNORS TO I. G. FARBENIND'USTRIE .AKTIEN-GESELLSCHAFT, OF FRANKFORT-ON-THE-MAIN, GERMANY, A. CORPORATION OFGERMANY COMPOSITION$ CONSISTING OF WOODEN FIBERS AND ARTIFICIAL THREADSNo Drawing. Application filed September 21, 1929, Serial No. 394,380,and in Germany September 22, 1928.

The present invention relates to mixed textile goods containing woolenfibers and such artificial threads as are derived from a mixedcelluloseester of nitric acid and a lower fatty acid, such ascellulosenitroformate,

cellulosenitroacetate and cellulosenitropropionate.

The term mixed textile goods is intended to include yarns as well astissues.

Mixed textile goods from woolen fibers and artificial threads preparedfrom uniform cellulose esters, especially cellulose acetate, cannot bedyed under the same conditions as pure wool, because the artificialcellulose ester threads lose their luster at temperatures ofv over 80 C.and especially at boiling temperature; they also curl and have theirvolume increased, so that their properties finally i'esemble those ofwool. Then, besides losing their silky character, the cellulose estersin this state do not sufiiciently resist wool-dyestuffs, and therefore,on dyeing the mixed goods the multicolored effects intended do not comeout correctly. All these disadvan- 2 tages are overcome by using insteadof a uniform cellulose ester a mixed cellulose ester of the kindreferred to above. The fiber mixtures thus prepared can be dyed in theusual manner and can be washed at a boil- 3 ing temperature without themixed cellulose esters losing their luster; moreover, these artificialthreads have an excellent resisting power, and furthermore it ispossible to submit such woolen fibers containing mixed cellulose estersto a carbonizing process, for example with an aluminum chloride solutionof 7 B. at 95 0., whereby vegetable constituents are removed withoutunfavorably influencing the artificial threads.

ing examples, without being limited there- Example 1.-Mixed textilegoods may con sist of 7 0 parts by weight of wool and 30 parts by weightof artificial fibers, the latter having The invention is illustrated bthe follow- 1 been prepared from nitro acetate cellulose,

which contains about 12% of nitrogen and about 54% of acetic acid. Ifthe artificial fiber is dyed as constituent of a carded yarn, preparedfrom the above described mixture, with a dyestufi fast to overdyeing,the wool constituents may be dyed afterwards under the usual conditions.Then the material may be carbonized with a lye of aluminum chloride ofabout 7 B. at a temperature of about 95 (3., in order to remove thevegetable constituents. Thereby the artificial fiber is not attacked.

Eaample .2. grams of a woolen tissue containing effect threads of nitroacetate cellulose, containing 1, 3% nitrogen, said efiectthreads beingintended to give the multicolored elfect to the mixed goods areintroduced into a dyeing bath of about 0. containing in a litre 1.25grams of azogrenadine S (compare Color Index 1924:, page 13 Nr. 54), 10grams of Glaubers salt calcined and 1,5 grams of sulfuric acid. Thetemperature is slowly raised to boiling and dyeing is effected for onehour. Then the tissue is washed rinsed and dried. The woolen fibers aredyed a clear red while the nitro acetate cellulose fibers remain purewhite and of a silky luster.

The nitrogen content of the mixed esters of cellulose used for thepurpose of the invention may vary within the widest limits, butgenerally we use esters having a nitrogen content of about 0.5 to 2%.These esters are obtainable by the usual methods, for example byacidylating according to known processes a nitro cellulose, having a lownitrogen content, according to the method described in German Patent295,889, or by acidylating the cellulose in the presence of concentratednitric acid, the quantity of the nitric acid depending on the desirednitrogen content of the mixed ester to. be prepared, say in the presenceof about 3 to 10% nitric acid calculated on the amount of the cellulose.

We claim 1. As new articles of manufacture mixed textile goods composedof woolen fibers and artificial threads prepared from a mixed celluloseester of nitric acid and a lower fatty acid being fast to boiling.

2. As new articles of manufacture mixed textile goods composed of woolenfibers and artificial threads prepared from a mixed cellulose ester ofnitric acid and a fatty acid of the group consisting of formic acid,acetic acid and propionic acid being fast to boiling.

'3. As new articles of manufacture Woolen tissues provided with effectthreads pre-' pared from cellulose nitro acetate, said effect threadsbeing fast to boiling.

In testimony whereof, we afiix our signatures.

ALBERT MoI-IRING. [14.8.] GUIDO SOHULTZE. [1,. s.] PAUL SCHLACK. [11.5.]

